Re: [PATCH] stack and rcu interaction bug in smp_call_function_mask()

[Jeremy Fitzhardinge]

Nick Piggin wrote:
> Nice debugging work.
>
> I'd suggest something like the attached (untested) patch as the simple
> fix for now.
>
> I expect the benefits from the less synchronized, multiple-in-flight-data
> global queue will still outweigh the costs of dynamic allocations. But
> if worst comes to worst then we just go back to a globally synchronous
> one-at-a-time implementation, but that would be pretty sad!
>   

What if we went the other way and strictly used queue-per-cpu?  It means 
multicast would require multiple enqueueing operations, which is a bit 
heavy, but it does make dequeuing and lifetime management very simple...

   J
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